Инструкции По Установке для 3com S7906E

 

1-3 

Figure 1-2 Broadcast transmission 

 

 

Assume that only Host B, Host D, and Host E need the information. If the information is broadcast to the 

subnet, Host A and Host C also receive it. In addition to information security issues, this also causes 

traffic flooding on the same subnet.  

Therefore, broadcast is disadvantageous in transmitting data to specific hosts; moreover, broadcast 

transmission is a significant waste of network resources.  

Multicast 

As discussed above, unicast and broadcast techniques are unable to provide point-to-multipoint data 

transmissions with the minimum network consumption.  

Multicast can well solve this problem. When some hosts on the network need multicast information, the 

information sender, or multicast source, sends only one copy of the information. Multicast distribution 

trees are built through multicast routing protocols, and the packets are replicated only on nodes where 

the trees branch. 

 shows the delivery of a data stream to receiver hosts through multicast.